人分这么几种：不认识，认识，熟人，朋友，知心朋友。朋友不在当面表白，而是背后说起朋友的时候，是否提到过你。

我今天才知道，我之所以漂泊就是在向你靠近。

The beauty of topological insulators lies in their robustness; their surface states are protected by symmetry and topology, making them immune to certain types of disorder.

市场永远在变，唯一不变的是对客户需求的深刻理解。

2000年：贝索斯致股东信《即使在最残酷的时期，也将努力把公司打造更具“重量”》

Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.

我们都在阴沟里，但仍有人仰望星空。

I like to be a free spirit. Some don't like that, but that's the way I am.